@mulambda382 "What first order level are you using to measures reliably down to 0.02mm?" Sokkia PL1

Just curious, who wrote the firmware patch / upgrade?

Factors affecting instrument height v's levels; tape measures in windy conditions, prism pole points pentrating marks, worn points, different tools us...

Photographs of level calibration of prism holder height. Note I've used one tribrach, one Topcon carrier (with thread attachment) and Sokkia AP41 car...

I set up two tripods, with a tribrach on one and the Sokkia PL1 level on the other and measured the relative height difference between the Sokkia AP01...

I uploaded these images previously, they don't display when I checked, so just uploading them again. Least squares suggests improving vertical accura...

Topcon GLS also has a height measurement plummet laser, but it's usually 2 to 3mm out compared to the height hook.

Leica height hook, true vertical measurement...

I measured the SX12 and discovered it was 195.5. Interestingly the Sokkia prisms and carriers I'm using are also 195.5. The Leica prisms I have are...

We do something similar using Leica's height hook, so we know the height off the tribrach, when wer're marking ground points. But now, for resected ...

We have a air transport case for three, it's setup at the beginning of the job and packed up at the end, we use them for recharging equipment batterie...

You don't need to worry about the coating on the 360 prism, it's unlikely that you will collimate with the glass surface, given the angle it's at. T...

My condolences, I can't imagine how hard it would be to deal with that, that's really tough.